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Effect of replacing dietary fish oil with soybean oil on growth performance, fatty acid composition and haematological parameters of juvenile meagre, A rgyrosomus regius
Author(s) -
Emre Yılmaz,
Kurtoğlu Adem,
Emre Nesrin,
Güroy Betül,
Güroy Derya
Publication year - 2016
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1111/are.12677
Subject(s) - biology , fish oil , docosahexaenoic acid , composition (language) , eicosapentaenoic acid , zoology , feed conversion ratio , linoleic acid , food science , soybean oil , juvenile , fatty acid , fish meal , arachidonic acid , polyunsaturated fatty acid , biochemistry , fish <actinopterygii> , body weight , fishery , endocrinology , ecology , linguistics , philosophy , enzyme
A nutrition trial with meagre, A rgyrosomus regius was assessed to determine the effect of dietary replacement of fish oil ( FO ) by soybean oil ( SO ) on the growth, feed utilization, body composition, fatty acid composition and basic haematological parameters. Six isonitrogenous (47% crude protein) and isoenergetic (gross energy 22 kJ/g) experimental diets were formulated by replacing 0 ( FO ), 20 (S20), 40 (S40), 60 (S60), 80 (S80) and 100 (S100) % of the FO with SO . Fish were fed three times daily to near satiation for 14 weeks. The specific growth rate ( SGR ) of fish fed S100 diet was significantly lower than the other treatments, except SO 80 diet. The fish fed SO 100 diet displayed significantly higher feed conversion ratio than that of other diets ( P < 0.05). It was observed that fish fed the SO 100 and SO 80 diets displayed haemoglobin ( HGB ) levels significantly lower ( P < 0.05) than fish fed the SO 20 diet. Packed cell volume ( PCV ) of fish fed SO 20 diet was significantly higher compared to SO 100. The white blood cell ( WBC ) and red blood cell ( RBC ) remained unaffected by dietary treatment. The docosahexaenoic acid (22:6n‐3, DHA ) and eicosapentaenoic acid (20:5n‐3, EPA ) levels of meagre were significantly reduced by the substituting of dietary SO by FO at the end of the feeding period. The level of linoleic acid (18:2n‐6, LA ) and linolenic acid (18:3n‐3, LNA ) significantly raised in fish fed with SO diets ( P < 0.05). The results of this study showed that SO could be replaced FO up to 80% in meagre diet without negative effect on growth performance and basic haematological parameters. Furthermore, the maximum level of FO replacement with SO determined by second order polynomial regression analysis, was 30.1% on the basis of maximum SGR .